Undercharged... WWYD and AIBU

Just got back from large chain shop. 40 min drive away. I bought a large cream blanket which was folded and tied up with a thick ribbon. It had a large card 'tag' with a price sticker attached to it. The only way of removing the tag was to untie the ribbons IYSWIM.

There was only one blanket in the shop and when I got home, I thought I'd quite like to order another so, I searched online using the barcode.

The barcode was for a £15 blanket and I paid £15. The on-line product search came up with a cheap looking thing - not the one I have.

I searched through the images and I actually have one that should have cost £85. My blanket has no label sewn on it but it's definitely the expensive one.

AIBU to just keep it and not say a word? I got it for £70 cheaper ffs! It's not worth £85 in my opinion & there's no way I'd have paid that but even so... WWYD?

TK Maxx by any chance? Many years ago I bought a complete birth to potty set of real nappies for £20, which when I went back a few days later in disbelief at my bargain to pick up a set for a friend, we're actually meant to be over £100. I didnt offer them the extra. Totally different if you're there doing a label switcheroo yourself, but this is their mistake

Twice I have been massively undercharged in a shop. Once a label didn’t scan and the person entered 3 instead of thirty.It was The Friday before Xmas and all I could think of was the persons till being wrong. So I said and paid the difference.

The 2nd Time was in B&Q. A 300 pound washing machine scanned at 30. They went out the back to check on “The System”. Guess what, the system out back matched the till. I just paid the 30 quid and wished them a nice weekend!

Designed No, the large card tag and barcode are for an entirely different blanket. It's even a different colour (no pics on tag).Both are still for sale online. All I can think is that a customer untied it at some point and the shop has tied the wrong ribbon/label on it when folding it back up?

Mumsnet is a funny place, on one thread they're all getting on a lather cos some kid stole a few sweets from someone's house and on this one they're all like chilled - yeah sure, why not? Or maybe the morality police will be here soon!

And before this thread takes off with posters that once bought a first class ticket back to Taiwan to repay the equivalent of 15p to a market stall trader, I'll just tell you that you should let it go and look forward to a warm winter.

Why not email John Lewis to let them know there blankets are labelled wrong and ask them if they would like you to return the item for a refund rather than pay the extra difference as it’s out of your budget. Put the decision in their hands as it’s their error

If you hadn't googled it, how would you have known? Enjoy your bargain, OP.

As a goodwill gesture you could tell the store their stock was wrongly labelled but I'd bet they'd tell you to keep it price sold, and if it's the only one it's not a mistake that will worry anyone. Different if a whole pile were mislabelled and if you went back to buy them all